there are unistallers in the M folders dont use setup or use windows controll panel then manualy delete everything Meridian the dmanually delete every registry entry. Then dowload a new setup.exe (common installer9 then its the same anywhay you will get stuck at 45% or something when trying to get mconfig

My stuff G98DH, G68J, DSP5200 ,DSP5200HC, DSP3100 HD621,AC11 , REL Stadium 3 Squeezebox Touch, Pioner BDP-LX71 ,Humax CXHD 5000C